Deploy the istio-egress-gateway helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the Istio Egress Gateway using a Helm chart on OpenShift using Pulumi, we'll take advantage of the Kubernetes provider's Helm support. Pulumi provides a resource named Chart that allows us to deploy Helm charts in a Kubernetes cluster.

Below is a step-by-step TypeScript program that deploys the Istio Egress Gateway Helm chart on OpenShift:

Setting up the Kubernetes Provider: You need to have the OpenShift cluster's kubeconfig file configured for Pulumi to communicate with your Kubernetes cluster. Pulumi reads this configuration from the default location (~/.kube/config), or the path specified by the KUBECONFIG environment variable.
Adding Necessary Imports: We'll import the @pulumi/kubernetes package, which contains the necessary Kubernetes resources, including the Chart resource for deploying Helm charts.
Creating a New Helm Chart Resource: Using the Chart resource, we can specify the name of the Helm chart, the repository where the chart is hosted, and the values we want to customize.
Deploying to OpenShift: The Helm chart will be applied to the specified OpenShift cluster, and Pulumi will ensure the chart is deployed and managed just as it would via the Helm CLI.

Here's how the implementation might look:

import * as k8s from "@pulumi/kubernetes";

// Creates a new Kubernetes provider instance that targets the OpenShift cluster.
// OpenShift uses a different set of permissions, so you might need to adjust RBAC policies accordingly.
const openshiftProvider = new k8s.Provider("openshift-k8s", {
    kubeconfig: "<your-kubeconfig>", // Replace with your OpenShift kubeconfig file content
});

// Deploy the Istio Egress Gateway Helm chart.
const istioEgressGateway = new k8s.helm.v3.Chart("istio-egress", {
    chart: "istio-egressgateway",
    version: "<chart-version>", // Specify the version of the chart if needed
    namespace: "istio-system", // Ensure that the Istio control plane is installed in this namespace
    fetchOpts:{
        repo: "https://istio-release.storage.googleapis.com/charts",
    },
    values: {
        // Customize the Helm chart values here if necessary
    },
}, { provider: openshiftProvider }); // Specify the OpenShift provider

// Export the gateway's status as an output; it can be a service name, an ingress host, etc.
export const egressGatewayStatus = istioEgressGateway.status;

In the above code:

We import the @pulumi/kubernetes package to be able to interact with our Kubernetes cluster. Make sure to install this package using npm or yarn.
We create an instance of the Kubernetes provider tailored for the OpenShift cluster by specifying the kubeconfig contents that Pulumi will use to authenticate.
We declare a new Chart resource for the Istio Egress Gateway Helm chart. We specify the chart and version that match the Istio chart we intend to install, and point to the Istio Helm repository. The namespace field should be set to the namespace where you have Istio installed; istio-system is commonly used.
We use the values field to provide any custom values needed to configure the Istio Egress Gateway. Replace placeholders and add configuration as necessary.
The provider option is important to ensure that the chart gets installed on your OpenShift cluster, not just any Kubernetes cluster.
To get live updates and feedback, Pulumi supports exporting status or other properties of the created resources. Here, egressGatewayStatus is an exported output that could be set to show important information about the deployment (like service name, ingress IP, etc.).

Before running this program, you need to install the Pulumi CLI, set up your Pulumi account, and configure access to your OpenShift cluster. Once that's done, you can execute pulumi up to launch the deployment. The Pulumi CLI will outline the changes it intends to make and prompt you for confirmation before proceeding.

If you are brand new to Pulumi and are looking for more detailed setup instructions, please visit the Pulumi's Getting Started documentation, which will guide you through the process of installing the Pulumi CLI, setting up a new Pulumi project, and writing your first Pulumi program.

Keep in mind that managing and operating Istio, particularly for a production environment, can become quite complex. The Pulumi program above assumes that you have sufficient permissions and have systems in place to manage the OpenShift cluster and the Istio service mesh requirements.